Come take a ride in my Ranger with my automatic. I can pull-start a 79,800 lb 18 wheeler with 33" tires. And trust me, its not slow or sluggish on takeoff. My motor is a stock V8 except for the exhaust (stock manifolds)...Maybe the trucks you have had were abused. Not all auto's are bad and sluggish. Remember, manual transmissions have clutches too, and eventually they need replacing as well
SVT
I've had PLENTY of guys tell me their automatics are great, they can tow anything, blah blah blah. Doesn't change the fact that every single one that I have owned has been a piece of junk. The guy I bought my F-150 from was towing a 30 foot travel trailer with it. I'd have raised hell about it, but he happens to be the guy who signs my paycheck.
I encounter the "pro's" all the time out on the road. These guys all own 1 ton dually diesels and they deliver campers to dealerships all over the country, from northern Indiana where they're made. Until recently, you would NEVER see them with anything but a Powerstroke Ford, or a Cummins Dodge. And they were all stick-shift. Every single one of them. You mention an automatic and you're likely to get a wrench thrown at you.
That was until recently though. I've been starting to see them running Chevys with the Duracell diesels and the Allison automatics. I guess what they say is the Allison is the same trans that goes in a school bus.
My problems have been with lighter duty trannies like the C4 that was in my 1976 F-100. It had no 2nd gear. I put a junkyard trans in it from a Lincoln Continental, and it was fine, had all 3 gears and didn't slip, but the truck just didn't have any power, even with the souped-up Mustang 302 I put in it with the 750 Holley.
My F-150 has an AOD, slips in all gears when towing.
About pull-starting an 18 wheeler with a ranger: I've seen humans do that on TV, you know, the big ugly muscle guys. DON'T do it again, though. You're severely torquing the **** out of EVERYTHING doing that, heating up that trans, you're lucky you didn't at least bust a U-joint. I KNOW you did it on pavement, or otherwise your ranger simply wouldn't be heavy enough to get the traction to do it. I towed an 11,000 lb Ford van chassis motor home with my little Honda Foreman 500 ATV. I had both of my girlfriend's fat brothers on it, one on each rack, for traction. The little quad did it, although it tore up the grass doing so. I'll never do something like that again, I just don't feel like replacing drive-train components. My quad is one of the rare ones that DON'T have an automatic or CVT these days. It's got an actual geared transmission, but has a centrifugal clutch instead of a manual one.
Another time when the splines in my old 71 VW Beetle's brake drum stripped out, it was "neutral in all gears". I walked home and the only thing available at the time to tow it home was my 1983 Honda Shadow 750 motorcycle. I towed it home with a rope, had a friend riding in the bug to steer it. That bike was awesome, when I was starting off I let the clutch fully engage early to save wear and tear on it, and momentarily had that engine lugged down so much I could feel the individual power strokes for a second.